Portsmouth, NH

Climate overview — based on NOAA 1991-2020 normals from ELIOT, ME US.

Year-round temperatures (°F)

10° 20° 30° J F M A M J J A S O N D
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Best time to visit Portsmouth

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Monthly averages

Month Avg High Avg Low Avg Temp Precipitation Snow Rainy days
January °F °F °F 3.39 in 15.9 in 10
February °F °F °F 3.53 in 16.2 in 8
March °F °F °F 4.58 in 10.5 in 10
April °F °F °F 4.71 in 1.2 in 10
May °F °F °F 3.97 in 12
June °F °F °F 4.32 in 11
July °F °F °F 3.85 in 10
August °F °F °F 3.60 in 9
September °F °F °F 4.00 in 8
October °F °F °F 4.83 in 0.1 in 10
November °F °F °F 3.97 in 0.9 in 10
December °F °F °F 4.67 in 11.0 in 11
Frost dates
Last spring / first fall frost
All-time records
Hottest, coldest, wettest
Planting calendar
What to plant, and when

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